Finebuild with existing installation

I unfortunately did not come across Finebuild until after I had already installed SQL Server 2008 R2 on a server. Is it possible to run it (or a subset of it) against an already installed instance? Specifically I would like to have Finebuild configure
all of the best practices for startup parameters, memory usage, etc. Thank you!

FineBuild v2 had separate code bases for each version of SQL Server and one of those releases did have this capability, but somehow this got lost when all the SQL versions were merged into the v3 code base. I only noticed this myself in March of this year and
aim to restore this capability, but nothing is available at present.

The FineBuild documentation does show the manual steps needed to do the configuration, but this is a lot of work to do if you have multiple servers to build.